Reference data analysis
What the year comparison shows for Lake Zug
Typical low point
413.41 m a.s.l.
November 25
Typical high point
413.64 m a.s.l.
July 17
Typical range
23 cm
Difference between daily medians
In the 1991-2020 reference period, Lake Zug's seasonal median is lowest on November 25 at 413.41 m a.s.l. and highest on July 17 at 413.64 m a.s.l.. The difference between these typical points is 23 cm. This describes the average seasonal cycle, not the largest individual fluctuation.
The 2026 curve currently contains 265 calendar days. On September 22 it shows 413.21 m a.s.l., which is 30 cm below that calendar day's median of 413.52 m a.s.l.. Compared with the same calendar day in 2025, the value is 54 cm lower.
Within the 1991-2020 reference period, the envelope reaches its highest value of 414.46 m a.s.l. on May 23 and its lowest value of 413.09 m a.s.l. on August 22. These are extremes of the displayed reference period, not all-time records.
The analysis uses the water-level series from Zug. Matching calendar days are compared, and the median is the middle value of the reference years. This classification does not replace flood warnings or local safety information.